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Mail order what. ??
I've no idea when it comes to this so I sure what's needed

Buying a handheld from a tuner in the US. They will need a list of modifications, and the 4 digit code from the computer. I believe there is only one computer code for a 03 HD unless something weird was done to import it into the UK. You will need to figure out what pulley ratio is on the truck

Buying a handheld from a tuner in the US. They will need a list of modifications, and the 4 digit code from the computer. I believe there is only one computer code for a 03 HD unless something weird was done to import it into the UK. You will need to figure out what pulley ratio is on the truck

in the last few days of research ive found some info is it an sct4 I need. and are email tunes the best way to go ??
I know the pulley sizes and mods.

I had Johnny lightning write me a tune at a car show I was at, truck sight unseen. I have a 14lb lightning lower an SCT ba2800 mass air flow sensor and a volant intake. Great drive ability and runs good. I think with moderate modifications the guys that have tuned a lot of these trucks has no issues writing a tune without data logging the truck. I am using a SCT X4

in the last few days of research ive found some info is it an sct4 I need. and are email tunes the best way to go ??
I know the pulley sizes and mods.

best, no.

it would be best to find a local SCT dealer / tuner that can do a dyno tune for your truck. Mail order tunes are only as good as your ability to communicate and work with the tuner - and would require a wide-band oxygen sensor added to your truck that you can datalog along with the other sensors on the truck. Only then, can an email/mail-order tune file be made to what I would call 'good enough to trust"